Determination of individual chlorinated biphenyls in agricultural products by automated capillary gas chromatography: determination in cattle feed and its relation to milk residues.
Polychlorinated biphenyls were determined by glass capillary gas chromatography with electron capture detection, with automatic splitless injection. Using a saponification step as clean-up procedure, the detection limit for individual polychlorinated biphenyls can be improved up to the sub-ppb level for vegetable material and up to the ppb level for fatty material. Quantification is carried out by comparison of separated chlorobiphenyl peaks with the corresponding individual chlorobiphenyl standards. The results of monitoring programs of milkfat and cattle feed are summarized. Accumulation factors for several chlorobiphenyls, determined in an experiment with lactating cows, are used to show that contamination of the milkfat is not caused by contaminated cattle feed.
D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D002417:Cattle; D002849:Chromatography, Gas / Q000379:methods*; D008892:Milk / Q000032:analysis*; D011078:Polychlorinated Biphenyls / Q000032:analysis*
D011078:Polychlorinated Biphenyls